Radio Shack TRC-494 owner manual Reducing Noise

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REDUCING NOISE

Because your CB is exceptionally quiet, any noise you hear is probably from an external source in your vehi- cle — the ignition, another radio, spark plugs, and so forth.

You can determine the source of the noise by turning off the engine and operating the CB with the ignition set to ACC. If most or all of the noise goes away, the problem is in your ve- hicle’s ignition or electrical system. Here are a few hints to help you re- duce or eliminate such noise:

Do not route the DC power cord next to the antenna wire.

Be sure the antenna’s magnetic base is securely attached to a metallic surface. If you use an antenna other than the mag- netic-mount type, be sure that the vehicle battery’s ground con- nection is secure.

Replace old ignition wires with new, high-voltage, noise-sup- pression ignition wires.

Install noise suppressors on your spark plugs or install spark plugs that have built-in suppres- sors.

If problems persist, check your alternator/generator and regula- tor gauges. Noise from these sources can be reduced or elimi- nated using bypass capacitors at the various voltage points.

Note: Your local Radio Shack store has a wide selection of noise-sup- pression equipment.

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Contents TRC-494 TRC-494 Digital Channel-Number Display IntroductionIntroduction FCC Information FCC Information Contents Contents Preparation Supplying PowerPreparation Attaching the Antenna Directly to the CB Attaching AntennaAttaching Antenna Using the Antenna’s Magnetic Base Using the Antenna’s Magnetic Base Using the CB Using the CB Setting Range Setting Range Using the Weatheradio Using the Weatheradio Common Uses for a CB Radio CB Operation TipsCB Operation Tips Maximum Range CB CourtesyCB Courtesy Code Meaning Using Common CodesUsing Common Codes Symptom Remedy TroubleshootingTroubleshooting Reducing Noise Reducing Noise Maintenance Maintenance Replacing the Power CORD’S Fuse Replacing the Power CORD’S Fuse Transmitter SpecificationsReceiver Specifications Fm Page 19 Thursday, August 5, 1999 1010 AM Fm Page 19 Thursday, August 5, 1999 1010 AM Radio Shack Limited Warranty Radio Shack Limited Warranty